Drilling machine



Nov. 10, 1931.. c. scHOLL DRILLING MACHINE- Filed March 1. 1928 5Sheets-Sheet 2 Nov. 10, 1931. c SCHOLL DRILLING MACHINE Filed March 1.1928 5 Sheets-Sheet 3 Nov. 10, 1931. c. SCHOLL 1,831,547

DRILLING MACHINE 5 Sheets-Sheet 4 Filed March 1, 1928 Nov. 10, 1931. cSCHOLL DRILLING MACHINE Filed March 1. 1928 5 Sheets-Sheet 5 INVENTOR 6g BY ATTORNEYQ Patented Nov. 10, 1931 UNITED "STATES PATENT. OFFICE ICLARK SCROLL, OF SPRINGFIELD, OHIO, ASSIGNOB TO THE STEEL PRODUCTSENGINEERING COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIODRILLING mpcnmn Application filed March 1,

This invention relatesto drilling machines of the automatic type.

One of the objects of my invention is to provide improved mechanism forarresting the tool and withdrawing it from the work at predeterminedintervals, and for restoring the tool to working position; a more specfic object in this connection being to accompllsh this resultautomatically. I

Another object of the invention is to provide means for automaticallyvarying the depth of cut of each successive drilling operation. IAnother object of the invention isto provide for automaticallystoppingthe feeding action of the tool spindle whenever the spindle ceased torotate due tounusual pressure thereon.

Other objects. of the invention Wlll appear from the accompanyingdescription and claims. 1 'In the accompanying drawings: Fig. 1-is anelevation of one side of a machine embodying the improvements.

F 2 is a longitudinal section of the drill spin le assembly.

Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4 is a section onthe line 4-4 of Fig. 2. Fig. .5 is a section on the line 5-5 of Fig. 4.Fig. 6 is a vertical section on the line 6--'6 of Fig. 1.

Fig. 7 is a detail of a fragmentary part of the worm wheel which form apart of the mechanism which feeds the drill and the devices which throwthe same into and out of operation.

Fig. 8 is a'section on the line 8--8 of Fig. 6. Fig. Sa-is a sideelevation of the feed cam and its associated cam arm.

Fig. 9 is a vertical section on the line 9-9 of Fig. 1. j

' Fig. 10 is a side elevation of a portion of the tripping disk and itspawls. v d

Fig. 11 is a plan view of the tripping disk feed cam and associatedparts.

12 is a vertical section on the line 1212 of Fig. 1. I

Fig. 13 is a side elevation of a portion of the devices forautomatically arresting the 1928. Serial No. 258,225.

drill. Fig.16 is a bottom plan view of the spindle assembly,and thefeeding'devices and withdrawing and restoring devices for same.

Drill spindle assembly 1 Referring first to Figs. 1-5 inclusive, thereis shown the construction of the drill spindle assembly. The spindle 1issecured into the threaded bore of one member 2 of a clutch,

the'other member 3 of which surrounds the member 2' and has a reducedsleeve portion 3 which is journaled upon the reduced extension 2 of theclutch member 2. The clutch member 2 has connected to rotate therewith ametallic disk 4 located between apair of fibre disks 5 and 6 which areconnected-to rotate with the clutch member 3. Coil [springs 7 areinterposed between the fibre disks 5 and a plug 8 in the end of theclutch member 3 to hold all of the disk in frictional engagement; acollar 9 vformed integrally with the clutch member 2 acting as anabutment. The sleeve portion 3 of the clutch member 3 is fitted on areduced shouldered portion formed on the forward end of a long sleeve 10soas to rotate therewith and the rear end of this sleeve has clutchfaces 11 adapted to engage with clutch faces 12 is of awell known typehaving an expanding ring indicated in dotted lines at 19, which engagewith the inner surface of a pulley 20 which is driven by the belt 21from an eleo 100 tric motor 22. The is expanded by a 'lar 25 which isslidably hasits forward. end secured to the extension 2'01? the clutchmember 2 and extends rear wardly through the clutch sleeve 13 where itis provided with an enlarged portion 26' having a recess 27 approachedby an inclined wall 27', (Fi 5). The clutch sleeve 13 has a pin 28 whicnormally lies in the recess 27. In the event however of the stoppage ofthe drill, which results in slippage of the clutch disks .4, 5 and 6,continued rotation of the clutch sleeve 13 also results in the pinriding upon theinclined wall 27 and sliding'the sleeve 13 to theposition shown in Fig. 5 to disengage the clutch teeth 11 and 12 tothereby stoprotation of the parts.

When the clutch teeth 11 and 12 are disengaged in this manner, they areagain caused to be engaged with each otherbythe operator inserting in anopening indicated in dotted lines at 29. in the journal 16 a small rodor pin to engage the end of the clutch sleeve 13 and pushing it towardthe clutch teeth 11; the drill spindle being turned by hand to theproper point to cause the pin 28 to enter the opening leading to therecess 27. r

Drill feeding mechanism located on the shaft 32 on each side of the worm31 and its reinforcin ring a shiftable ,clutch member 35 and 36 w ichclutch mem-,

bers are provided with flanges 37 apertu'red to receive pins 38 whichextend through the web of the worm so asto rotatably connect the clutchmembers with the worm (see also Figs. 7 and 8). Loosely mounted-upon anextended portion of the bushin 33 is a spiral pinion 39 which has clutchteet 40 to engage with the clutch teeth of the clutch member 36 torotate the pinion from the worm wheel. This pinion meshes with thespiral gear 41, fast to a longitudinal shaft 42 (see also Figs. 9 and16), which has a worm 43 driv'ing'a worm wheel'44 on a transverseshaft45 Suit". ably mounted in the frame.

Connected with the shaft 45 is a sleeve 46' having fast thereto a cam47. The connection between the shaft and sleeve ispreferably.madethrough a hand-operated clutch member 48, having clutch teeth 49 movableinto and out of engagement with clutch teeth 50 on the sleeve 46 andheld in different positions by the spring pressed detent 51, the'purjwork.

pose of this connection being to rmit the drill to be withdrawn by handi necessary independently of the mechanism which feeds it, this beingaccomplished by disconnecting.

the clutch teeth 49 and 50 and rotating; the

sleeve 46' and cam 47 by a. hand wheel 48" keyed to the sleeve 46,together with the train of devices about to be described. Cooperatingwith the cam 47 is a cam roller 52 see Figs. 1, 11 and 16) on thefreeend of a roc or arm 53. This rocker arm is connected with one end ofa transverse shaft 54 (see also Figs. 12 and 16) locatedin suitablebearings in the frame, and connected to the other end of the shaft is aninternal gear 55. Meshing with this gear is a pinion 56 connected withone end of a short shaft 57 rotatably mounted in a rocker arm 58 mounttdloosely upon the shaft 54. The other end of this shaft 57 has connectedtherewith a pinion 59 meshing with shaft 54. Meshing with this gear 60is a pin ion 61 loosely mounted upon brackets 62 depending from theframe member and this pin sembly mounted therein through theinstrumentality of ball bearings 65 which are retained by the ring 66 annut 67. This sleeve 64 is slidably mounted in a block 68 depending fromthe frame as shown best in Fig. 12. In the arrangement just described aslow feedin movement is im arted to the spindle assem ly to feed therill into the DmZl arresting and withdradflng devices so as to positionthe dogs at various predetermined oints with relation tothe cam 47. Eachof t esedogs has an inclined face 72 adapted to make contact with aivoted spring-pressed pawl 73 carried on t e free a gear 60 which isloosely mounted upon the V end of an arm 74 connected with arock shaft75. This rock shaft-has an. arm 76 which when the shaft is rocked makescontact with the rod 77 which extends through the shaft 32 previouslydescribed, as shown in Fi 6, 7 and 8. This rod has a pair of pins 78 wich project through slotted openings 79 in the shaft and into slottedopenings 80 in the 83- (Figs. 12-15 for detail). Attached. to thiseccentric disk is a chain 84 which ex tends rearwardly and is connectedwith a block 85 (Figs. 1 and 6) which is slidably mounted on a rod 86about which is coiled alongs ring 87 which has been laced under tensiony the operation of fee ing the drill so thatwhen the clutches 36 and 40are disengaged this spring acts to rotate the gear 60, which through themedium of the pinion 61 and rack 63 withdraws the drill assembly. Thiswithdrawing movement however is controlled by the cam 82,'which has twosimiiar inclined faces leading to the high point of the cam. Co-ocrating with the cam is a cam roller 88 igs. 1 and 16) mounted between apair of arms 89 which are pivoted at 90 to a suitable point on theframe. The lower ends of the arms have connected therewith a forwardlyextending link 91 which is pivotally connected with an extension-58 ofthe arm 58. As the gear 60 rotates under the influence of the spring itof course rotates the pinions 56 and 59, but, as the large internal gearhas ceased to rotate due to the disengagement of the clutches 32 and 40,the pinion 56 rides around the gear 55,

at a speedcontrolled by the movement of the cam 82, thus controlling thespeed of withdrawal of the tool assembly. The initial engagement of thecam roll 88 is with the high part of the cam and the withdrawalmovement, of the tool takes place during and 58' are rocked in theopposite direction, thereby causing reverse rotation of the pinions 56and 59, gear 60 and inion 61, restoring the tool to drilling position.

At this point the clutches 35 and 81 are disengaged and the clutches 36and40 engaged by reason of a projection 92 (Figs.

- 7 and 16) on the cam 82 striking a beveled nose 93 on a lever 94pivoted at 95 to a suitable point and having a yoke 96 straddling a pin97 connected with the pivoted lever 98 which has two pins 99 extendingin a rooved collar 100 on the end of the rod 7 which acts to move therod axially and through the pins 78 shift the clutch members 35 and 36.A spring-pressed pawl 101 having a pair of beveled faces coacts with apair of beveled faces on a part 102 secured to an offset portion of thelever 98 to yieldably lock the clutches in either of their shiftedpositions.

When the tool has completed its final drilling operation ,means areprovided for disenga 'n% the clutch 15, by operating the clutcfi s ifter23. Projectingfrom the arm 53 near its pivotal point is a nose 103carrying a spring pressed pawl 104 (Fig. 13).

This pawl cooperates with inclined faces on operations.

a dog 105 formed on a lever 106 pivoted at 107 to a suitable point onthe frame. The lower end of this lever has a pin or pins 108 whichproject into a grooved collar 109 on the end of a rod 110 (see also Fig.1). A spring 111 is coiled about the rod and is interposed between theframe and a collar 112 secured to the rod so as tonormally project therod rearwardly. The rear end of the rod has a collar 113 fixed theretoand in front of this collar there is a block 114 loosely threaded on therod and having a pin 115 which projects loosely into the lower end of arocker arm 116 pivoted at 117 to a suitable frame part. The upper end ofthe rocker arm 116 has a pin 119 which projects into a slot inthe clutchshifter 23. The tendency of the spring 111 is to shift the-rod 110rearwardly so as to engage the clutch members, but when the pawl 104rides upon the beveled nose 105' it shifts the rod forwardly todisengage the clutch members. Ahand lever 118 connected with the rockerarm 116 provides a manual means for engaging the clutch members.

M ewris for varying the feed of the drill It has been explained that thedisk 69 has openings 71 in which dogs may be secured.

When it is desired to vary the feed of the tool into the work during thedrilling opera-' is of such length that at theend of the last 1 drillingoperation the cam roller 52 rides upon the inclined surface 4 of the camto thereby reverse the swinging movement of the arm 53 which allows thespring 86 to rotate the gear 60 in the opposite direction Generaloperation In operation, the dogs 70 are positioned in the opening 71 ofthe disk 69 to give to each separate drilling operation the depthdesired it being the desirable practice to gradually decrease the depthof subsequent drilling The machine may be started with the cam roll 52at the zero point as shown in Fig. 8a, or by disengaging the clutchteeth 50 the cam maybe rotated with the hand wheel 48 to bring'the drillto working position, in which case the cam roll 52 will be initiallylocated on an inclined portion of the cam. 47. After these preliminaryadjustments have been made the operator engages the motor clutch tostart rotation of the spindle and the feed cam, the clutches 36 clutchand cam- :for feeding the spindle to feeding cam and starts rotation ofthe cam points on said disk, each of said dogs being claimed:

and 40. being at this stage engaged and the perform the drillingoperation-after it has cam roller 88 being positioned on the high beenprojected into working position, said part of the cam 82. .The cam 47rotates and cam being of a length capable of imparting feeds the spindleand its tool through the conthe maximum range of feeding movement tonections described until the first dog on the said spindle by a singlerotation thereof, disk 69 rocks the arm 74, which through the shiftingdevices for simultaneously shifting means described disengages theclutch memsaid clutches, a v disk movable withsaid cam,

bers 36 and 40 and engages the clutch memand a plurality of dogs,together with means bers 35 and 81. This stops the rotation of the forco n ing the s a predetermined 82 whereupon the direction ofrotation ofthe pted to operate said clutch shifting deloose gear 60 is reversed bythe action of the Vicesspring 87 by reason of its connection through thechain 84 and eccentric 83 with this geai,-dey1ces for'said s indleincluding an internal thereby causing the drillspindle assembly v ng gr, a 0059 g op r ively nto be withdrawn, this withdrawal being cone t dWith said spindle, a pair of connected trolled by the action of theroller 88 upon p mons meshing respectively with said 'inthe cam 82 andconnection 91 with the arm rn ldriving gear and'said loose gear, a whichcarries the pinion 57, as it will be e l rm upon which said pinions arecarunderstood that the gear 60 can only rotate P me ns for rotating saidinternal gear as fast as permitted by the movement of th including aclutch, devices rotatable with said pinion 57 about the internal gear55, which is fl gm n to disengage said clutch, a now stationary. So soonas the cam roller 88 p g connected W th said loose ear to rehas reachedthe low point of the cam-82, the verse its IOttttlOIl when said 'clutcis disenwithdrawal movement of the spindle assemg g and m ns connectedwith Said rocker bly has been completed and when the roller m 1 II i Ithe action of said spring. I 88 starts up the opposite side of the cam82, n 4 a d g member, atool sp the direction of rotation of the loosegear e ng meehanism for said spindle in-. 60 will be reversed because ofthe fact that eluding & drive g $10059 g p i y the arm which carries thepinion 59 will be collIiected h i spindle, driving conrocked in theopposite direction causing the 131011 between sald gears, a rocker armon pinion to rotate in the opposite direction and in h said drivingconnection is mounted; th b t t the gear (50 d i i 61 t w thdrawing andrestoring devices for said f d th d ill bl f dl A th spindle including aspring for rotating said cam surfaces of'the cam 82 are alikethe drill10986 g ar in the reverse direction to withspindle will be returned adistance equal to r w sald spindle, a double-face cam, a cam a Inadrill, a rotatable spindle, feeding th t f it withd awal, s soon as thcam lever cooperating with said cam having a conll 83 h h d th hi h i tf th nection with said rocker arm to control the cam 82, the clutchesare again shifted by conwithdrawal of said spindle and to thereaftertact of the projection 92 of the cam 82 with k id arm o restore thespindle to workthe beveled nose 93, whereupon rotation of P 911; S idfeeding mechanism and the cam 82 ceases and rotation of the feed cam l wpg and ring devices including 47 starts to feed the drill into the work.clutch d t a m ns movable with said Having thus described the invention,it is feeding mechamsm to operate said clutch de- I vices to disconnectsaid drive gear from and d ill, r tat bl d ill i dl connect said camwithsaid driving member,

V means for periodically projecting and withand means movable With thewithdrawal and 7 been projected into working position, said cam bei f ale th p bl f i ti g a driving member, a drill assembly having a 'saidclutches, and a plurality of adjustable said rotatable member and saiddrive shaft, a

drawing. the s indle to and f ki restoring devices to operate saidclutch deiti i l di g a l t h, means i l di vices. to disconnect thewithdrawal and rea clutch and cam for feeding the spindle to g f Ce frm-andconnect the feeding perform the drilling operation after it hasmechalllsm Wlth salddliving member- 5. .In a machine of the character"described,

the maximum range of feeding movement to rotatable member connected Withsaid dIlV- said spindle by a single rotation thereof, mg member,a'driveshaft arranged at right shifting devices for simultaneouslyshifting angles ,to said drill assembly, gears between devices movablewith said cam to operate said second shaft extending parallel with theroclutch shifting devices at predetermined tatable member of said drillassembly, means times in the rotation of said cam. for driving saidsecond shaft from said drive 2. In a drill, a rotatablev drill spindle,shaft including a clutch, a third shaft armeans for periodicallyprojecting and withrangedat right angles to said second shaft drawingthe spindle to and from working poand geared thereto, means connectingsaid s1ti0n including a clutch, means ncluding a third shaft with saiddrill assembly to feed meme? the drill into the work, a plurality ofdogs on said third shaft rotating therewith, devices for withdrawingsaid drill assembly and restoring the same to working position, meansfor connecting said devices with said drive shaft including a clutch, aclutch shifter common to said clutches, connections for operating saidclutch shifter from said dogs,'and means for operating said clutchshifter from said withdrawing and restoring devices.

In testimony whereof, I have hereunto set my hand this 9th day ofFebruary, 1928.

CLARK SCHOLL.

